CN208000381U - A kind of neutron-gamma detector - Google Patents
A kind of neutron-gamma detector Download PDFInfo
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- CN208000381U CN208000381U CN201721604129.9U CN201721604129U CN208000381U CN 208000381 U CN208000381 U CN 208000381U CN 201721604129 U CN201721604129 U CN 201721604129U CN 208000381 U CN208000381 U CN 208000381U
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- neutron
- cup
- photomultiplier
- gamma
- scintillator
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Abstract
The utility model is related to a kind of neutron-gamma detector, the detector includes cup-shaped scintillator, photomultiplier, slow body, GM counting tubes, preamplifier, shell, counting circuit, processor, function module, low-tension supply and high voltage power supply;Wherein, the cup-shaped scintillator be cup-like structure, inner surface is glass light guides, and shell is aluminium, between inner surface and shell fill ZnS (Ag) powder+boric acid+6LiF mixtures;Cup-shaped scintillator is sleeved on photomultiplier photocathode, and cup-shaped scintillator is coupled with the time of photomultiplier grade contact surface using optical coupled dose;The outside of cup-shaped scintillator is cased with slow body, and the slow body is hollow cylindric, the matching size conjunction of inner ring size and cup-shaped scintillator;Slow body front end is provided with a strip-shaped groove, and GM counting tubes are placed in groove.The utility model substantially increases neutron response;Cup-shaped scintillator is non-friable, encapsulation is simple, and detector is of low cost, can measure neutron and gamma simultaneously.
Description
Technical field
The utility model is related to technical field of nuclear radiation measurement, and in particular to a kind of neutron-gamma detector.
Background technology
Neutron gamma radiometer can be used for dose monitoring, is widely used in nuclear reactor, nuclear power station and other isotopes and answers
With the neutron dose rate and gamma Dose rate measurement in place, difference replaces probe when having the characteristics that measure, and exceeds given threshold
And alarm, avoid personnel by excessive dose of radiation.
It is mainly applied to the neutron detector of the quasi-instrument at present3He counting tubes,6LiI (Eu), Li glass detectors etc.,
70% neutron detector is all to use in the world3He counting tube detectors, but in recent years3He gas prices skyrocket, and are based on3He's
Detector price is also very expensive, and it is extremely urgent to design novel neutron detector.In addition6LiI (Eu), Li glass detectors
Resistance to gamma performance is poor.
Invention content
The purpose of this utility model is that:For at this stage be applied to neutron gamma radiometer detector it is expensive,
The shortcomings that resistance to gamma poor performance, proposes a kind of neutron gamma detector cheap, gamma rejection is high, detection efficient is high
Scheme.
The technical solution of the utility model is as follows:A kind of neutron-gamma detector, the detector include cup-shaped flicker
Body, photomultiplier, slow body, GM counting tubes, preamplifier, shell, counting circuit, processor, function module, low tension
Source and high voltage power supply;
Wherein, the cup-shaped scintillator is cup-like structure, and inner surface is glass light guides, and shell is aluminium, inner surface and outer
Between shell fill ZnS (Ag) powder+boric acid+6LiF mixtures;Cup-shaped scintillator is sleeved on photomultiplier photocathode, cup-shaped flicker
Body is coupled with the contact surface of photomultiplier using optical coupled dose;The outside of cup-shaped scintillator is cased with slow body, and described is slow
Change cylindric, the matching size conjunction of inner ring size and cup-shaped scintillator that body is hollow;Slow body front end is provided with a strip
Connected in star, groove is interior to place GM counting tubes;
Cup-shaped scintillator, photomultiplier, slow body, GM counting tubes, preamplifier are placed in and are protected from light in shell;It is described
Photomultiplier, preamplifier, counting circuit, processor and function module are sequentially connected;Low-tension supply respectively with preceding storing
Big device, counting circuit, processor, function module are connected;High voltage power supply is connected with photomultiplier.
Photomultiplier is used to the optical signal of scintillator being converted into electric signal;The photomultiplier is four face-port types
Photomultiplier.The slow body is used for incident Moderation of the fast neutrons being slow thermal neutron, improves the energy response of instrument;Institute
The slow body stated uses polythene material.The GM counting tubes are for detecting gamma signal.The preamplifier is used for
Amplify the output signal of photomultiplier, improve signal-to-noise ratio, promotes load capacity.The counting processing circuit include filtering,
It screens, shaping feature;Filtering, the interference signal by a small margin and noise for screening preamplifier output, it is larger to retain amplitude
Pulse;It is calibration pulse by the signal shaping after examination.
The processor is used for the neutron and gamma signal that count pick up processing circuit transmits, and neutron and gamma are believed
Number it is respectively converted into neutron fluence value and gamma dose value, and conversion results are sent to function module.The function module tool
There are display, alarm, storage and data export function, including display screen, indicator light, buzzer, memory, Infrared Transmission, function
Keyboard.
Light collection efficiency, reflecting layer MgO are improved for preventing light from escaping in the reflecting layer;The shell is used for
It prevents external interference and improves scintillator light collection efficiency.The neutron detector is cup-shaped scintillator, and outer diameter is φ 20-
70mm, a height of 15-50mm, it is 28.5mm, outer diameter 35mm, a height of 31mm that the preferred size of cup-shaped scintillator, which is internal diameter,;It is described
Slow body outer ring structure a diameter of φ 50-150mm, length 40-200mm;The preferred size of the slow body is
The remarkable result of the utility model is:
1) neutron-gamma detector of the utility model design, and four face-port type photomultipliers are used, increase detection
The neutron-sensitive area of device, greatly improves neutron response.And cup-shaped scintillator material is non-friable, encapsulation is simple, detector at
This is cheap and insensitive to gamma, and gamma rejection is high.
2) use boric acid and LiF mixtures as neutron-sensitive substance in the utility model, neutron and sensitive substance core are anti-
The target nucleus number answered increases, and improves reaction probability, can also increase neutron response.
3) polyethylene slow body is used in the utility model, embed cup-shaped scintillator and GM pipes detector, it can be achieved that neutron,
Gamma while Effect on Detecting.
Description of the drawings
Fig. 1 is a kind of neutron-gamma detector schematic diagram described in the utility model;
In figure:Cup-shaped scintillator 1, photomultiplier 2, slow body 3, GM counting tubes 4, preamplifier 5, be protected from light shell 6,
Counting circuit 7, processor 8, function module 9, low-tension supply 10, high voltage power supply 11 form.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment is further to a kind of neutron-gamma detector work described in the utility model
It is described in detail.
As shown in Figure 1, a kind of neutron-gamma detector, the detector includes cup-shaped scintillator 1, photomultiplier
2, slow body 3, GM counting tubes 4, preamplifier 5, shell 6, counting circuit 7, processor 8, function module 9, low-tension supply 10
With high voltage power supply 11;Wherein, the cup-shaped scintillator 1 is cup-like structure, and inner surface is glass light guides, and shell is aluminium, interior table
Between face and shell fill ZnS (Ag) powder+boric acid+6LiF mixtures;Cup-shaped scintillator 1 is sleeved on the photomultiplier of four face-port types
On 2, cup-shaped scintillator 1 is coupled with the time of photomultiplier 2 grade contact surface using optical coupled dose;Outside cup-shaped scintillator 1
Portion is cased with slow body 3, and the slow body 3 is hollow cylindric, the matching size of inner ring size and cup-shaped scintillator 1
It closes;3 front end of slow body is provided with a strip-shaped groove, and GM counting tubes 4 are placed in groove;Cup-shaped scintillator 1, photomultiplier 2,
Slow body 3, GM counting tubes 4, preamplifier 5, which are placed in, to be protected from light in shell 6;
The photomultiplier 2, preamplifier 5, counting circuit 7, processor 8 and function module 9 are sequentially connected;Low pressure
Power supply 10 is connected with preamplifier 5, counting circuit 7, processor 8, function module 9 respectively;High voltage power supply 11 and photomultiplier transit
Pipe 2 is connected.
The slow body 3 uses polythene material.Boric acid and6LiF be neutron-sensitive substance, neutron with it is therein sensitive
Nuclear reaction occurs for nucleic, and product core makes ZnS (Ag) flashing.The photomultiplier 2 is used for the optical signal of scintillator
It is converted into electric signal.The time grade of the photomultiplier 2 is four face-port types.The slow body 3 is used for the fast of incidence
Moderation of neutrons is slow thermal neutron, improves the energy response of instrument;The internal diameter of cup-shaped scintillator 1 is 28.5mm, outer diameter 35mm, height
For 31mm;3 outer ring structure of slow body a diameter of φ 50-150mm, length 40-200mm;The slow body 3 it is excellent
It is φ 90mm × 50mm to select size.
The GM counting tubes 4 are for detecting gamma signal.It improves light for preventing light from escaping and receives in the reflecting layer 4
Collect efficiency, reflecting layer MgO.The shell 6 is for preventing external interference and being protected from light.The preamplifier 5 is for putting
The output signal of big photomultiplier 2, improves signal-to-noise ratio, promotes load capacity.The counting processing circuit 7 include filtering,
It screens, shaping feature;Filtering screens interference signal by a small margin and noise that preamplifier 5 exports, and it is larger to retain amplitude
Pulse;It is calibration pulse by the signal shaping after examination.During the processor 8 is transmitted for count pick up processing circuit 7
Son and gamma signal, are respectively converted into neutron fluence value and gamma dose value, and conversion results are sent by neutron and gamma signal
To function module 9.The function module 9 has display, alarm, storage and data export function, including display screen, instruction
Lamp, buzzer, memory, Infrared Transmission, function keyboard.
The course of work is as follows:In neutron and scintillator6Li,10Nuclear reaction occurs for B, and the product core of generation makes ZnS (Ag) flicker
Body shines.Photon reaches photomultiplier photocathode, and optical signal is changed into electric signal.Gamma detector is counted by slow body front end GM
Number pipe is detected.Electric signal is amplified by preamplifier, is filtered, is screened, after shaping through counting processing circuit
Form standard square pulse signal.Pulse signal is sent to processor, and neutron dose value, function module are obtained after carrying out algorithm calculating
It is responsible for the functions such as display, alarm, storage, data export.When neutron dose (rate) value be higher than threshold value when, instrument can give spoken, light
Alarm reminds staff to take corresponding measure.
Claims (10)
1. a kind of neutron-gamma detector, it is characterised in that:The detector includes cup-shaped scintillator (1), photomultiplier
(2), slow body (3), GM counting tubes (4), preamplifier (5), be protected from light shell (6), counting circuit (7), processor (8), work(
It can module (9), low-tension supply (10) and high voltage power supply (11);
Wherein, the cup-shaped scintillator (1) is cup-like structure, and inner surface is glass light guides, and shell is aluminium, inner surface and shell
Between filling ZnS (Ag) powder+boric acid+6LiF mixtures;Cup-shaped scintillator (1) is sleeved on the photocathode of photomultiplier (2), cup
Shape scintillator (1) is coupled with the photocathode contact surface of photomultiplier (2) using optical coupled dose;Outside cup-shaped scintillator (1)
Portion is cased with slow body (3), and the slow body (3) is hollow cylindric, the size of inner ring size and cup-shaped scintillator (1)
It matches;Slow body (3) front end is provided with a strip-shaped groove, and GM counting tubes (4) are placed in groove;
Cup-shaped scintillator (1), photomultiplier (2), slow body (3), GM counting tubes (4), preamplifier (5) are placed in and are protected from light
In shell (6);
The photomultiplier (2), preamplifier (5), counting circuit (7), processor (8) and function module (9) phase successively
Even;Low-tension supply (10) is connected with preamplifier (5), counting circuit (7), processor (8), function module (9) respectively;High pressure
Power supply (11) is connected with photomultiplier (2).
2. a kind of neutron-gamma detector as described in claim 1, it is characterised in that:Outside the cup-shaped scintillator (1)
Diameter size is φ 20-70mm, a height of 15-50mm;The a diameter of φ 50-150mm of slow body (3) outer ring structure, length are
40-200mm。
3. a kind of neutron-gamma detector as described in claim 1, it is characterised in that:Photomultiplier (2) will be for that will flicker
The optical signal of body is converted into electric signal;The photomultiplier (2) is four face-port type photomultipliers.
4. a kind of neutron-gamma detector as described in claim 1, it is characterised in that:The slow body (3) is used for enter
The Moderation of the fast neutrons penetrated is slow thermal neutron, improves the energy response of instrument;The slow body (3) uses polythene material.
5. a kind of neutron-gamma detector as described in claim 1, it is characterised in that:The GM counting tubes (4) are for visiting
Survey gamma signal.
6. a kind of neutron-gamma detector as described in claim 1, it is characterised in that:The preamplifier (5) is used for
Amplify the output signal of photomultiplier (2), improve signal-to-noise ratio, promotes load capacity.
7. a kind of neutron-gamma detector as described in claim 1, it is characterised in that:The counting circuit (7) includes filter
Wave, examination, shaping feature;Filtering, the interference signal by a small margin and noise for screening preamplifier (5) output, retain amplitude
Larger pulse;It is calibration pulse by the signal shaping after examination.
8. a kind of neutron-gamma detector as described in claim 1, it is characterised in that:The processor (8) is for receiving
The neutron and gamma signal that counting circuit (7) transmits, and neutron and gamma signal are respectively converted into neutron fluence value and gamma
Dose value, and conversion results are sent to function module (9).
9. a kind of neutron-gamma detector as described in claim 1, it is characterised in that:The function module (9) has aobvious
Show, alarm, storing and data export function, including display screen, indicator light, buzzer, memory, Infrared Transmission, function keyboard.
10. a kind of neutron-gamma detector as described in claim 1, it is characterised in that:The shell (6) that is protected from light is used for
It prevents external interference and improves scintillator light collection efficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721604129.9U CN208000381U (en) | 2017-11-27 | 2017-11-27 | A kind of neutron-gamma detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721604129.9U CN208000381U (en) | 2017-11-27 | 2017-11-27 | A kind of neutron-gamma detector |
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| Publication Number | Publication Date |
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| CN208000381U true CN208000381U (en) | 2018-10-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111221030A (en) * | 2019-12-03 | 2020-06-02 | 北京卫星环境工程研究所 | Neutron-gamma detector based on physical integration and neutron-gamma online screening method |
-
2017
- 2017-11-27 CN CN201721604129.9U patent/CN208000381U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111221030A (en) * | 2019-12-03 | 2020-06-02 | 北京卫星环境工程研究所 | Neutron-gamma detector based on physical integration and neutron-gamma online screening method |
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